* test/ruby/enc/test_regex_casefold.rb: Added data-based testing for

  String#downcase :fold.
* enc/unicode.c: Fixed a range error (lowest non-ASCII character affected
  by case operations is U+00B5, MICRO SIGN)
* test/ruby/enc/test_case_mapping.rb: Explicit test for case folding of
  MICRO SIGN to Greek mu.
(with Kimihito Matsui)


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53749 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 15 insertions, 0 deletions

diff --git a/test/ruby/enc/test_case_mapping.rb b/test/ruby/enc/test_case_mapping.rb
index 2c712e448d..0336e3f32f 100644
--- a/test/ruby/enc/test_case_mapping.rb
+++ b/test/ruby/enc/test_case_mapping.rb
@@ -63,6 +63,7 @@ class TestCaseMappingPreliminary < Test::Unit::TestCase
     check_downcase_properties   'ss', 'ß', :fold
     check_downcase_properties   'fifl', 'fifl', :fold
     check_downcase_properties   'σ', 'ς', :fold
+    check_downcase_properties   'μ', 'µ', :fold # MICRO SIGN -> Greek mu
   end
 
   def test_turcic
diff --git a/test/ruby/enc/test_regex_casefold.rb b/test/ruby/enc/test_regex_casefold.rb
index 825a02ae06..808ea14c90 100644
--- a/test/ruby/enc/test_regex_casefold.rb
+++ b/test/ruby/enc/test_regex_casefold.rb
@@ -8,6 +8,15 @@ class TestCaseFold < Test::Unit::TestCase
   UNICODE_VERSION = UnicodeNormalize::UNICODE_VERSION
   CaseTest = Struct.new :source, :target, :kind, :line
 
+  def check_downcase_properties(expected, start, *flags)
+    assert_equal expected, start.downcase(*flags)
+    temp = start
+    assert_equal expected, temp.downcase!(*flags)
+    assert_equal expected, expected.downcase(*flags)
+    temp = expected
+    assert_nil   temp.downcase!(*flags)
+  end
+
   def read_tests
     IO.readlines(File.expand_path("../../../enc/unicode/data/#{UNICODE_VERSION}/CaseFolding.txt", __dir__))
     .collect.with_index { |linedata, linenumber| [linenumber.to_i+1, linedata.chomp] }
@@ -75,7 +84,12 @@ class TestCaseFold < Test::Unit::TestCase
         end
       end
     end
+  end
 
+  def test_downcase_fold
+    @@tests.each do |test|
+      check_downcase_properties test.target, test.source, :fold
+    end
   end
 
   # start with good encodings only